A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:
Solution
Answer: Option B
Explanation:
Ratio of times taken by A and B = 1:3.
The time difference is(3-1)2 days while B take 3 days and A takes 1 day.
If difference of time is 2 days, B takes 3 days.
If difference of time is 60 days, B takes 3/2x60 = 90 days.
So, A takes 30 days to do the work.
A's 1 day's work = 1/30
B's 1 day's work = 1/30
(A + B)'s 1 day's work =(1/30+1/90)=4/90=2/45
A and B together can do the work in45/2= 22 1/2days.
Answer: Option B
Explanation:
Ratio of times taken by A and B = 1:3.
The time difference is(3-1)2 days while B take 3 days and A takes 1 day.
If difference of time is 2 days, B takes 3 days.
If difference of time is 60 days, B takes 3/2x60 = 90 days.
So, A takes 30 days to do the work.
A's 1 day's work = 1/30
B's 1 day's work = 1/30
(A + B)'s 1 day's work =(1/30+1/90)=4/90=2/45
A and B together can do the work in45/2= 22 1/2days.